babel-loader.js

export default function babelLoader(options) {
	return {
		test: /\.jsx?$/,
		exclude: /node_modules/,
		loader: require.resolve('babel-loader'),
		query: {
			presets: [
				[require.resolve('@babel/preset-env'), {
					targets: {
						browsers: [
							'last 2 Chrome versions',
							'last 2 Firefox versions',
							options.browsers && String(options.browsers).match(/(\bie(\b|\d)|internet.explorer)/gi) && 'ie>=9'
						].filter(Boolean)
					},
					corejs: 2,
					useBuiltIns: 'usage',
					modules: false,
					loose: true
				}]
			],
			plugins: [
				[require.resolve('@babel/plugin-proposal-object-rest-spread'), {
					loose: true,
					useBuiltIns: true
				}],
				[require.resolve('@babel/plugin-transform-react-jsx'), {
					pragma: options.pragma || 'h'
				}]
			].concat(
				options.coverage ? [require.resolve('babel-plugin-istanbul')] : []
			)
		}
	};
}